Characterization of Square Segregation in TC18 Titanium Forged Bar

Ding Chen; Xu Zhengfang; Zhang Naijun

doi:10.15980/j.tzzz.2018.07.024

Views : 0 下载量: 91 CSCD: 0

Export
Share
Collection
Album

Characterization of Square Segregation in TC18 Titanium Forged Bar
Vol. 38, Issue 7, Pages: 784-787(2018)
Published： 2018 ，
DOI： 10.15980/j.tzzz.2018.07.024

扫描看全文

[1]丁晨,许正芳,章乃俊.TC18钛合金锻棒的方形偏析显微特征[J].特种铸造及有色合金,2018,38(07):784-787.

Ding Chen, Xu Zhengfang, Zhang Naijun. Characterization of Square Segregation in TC18 Titanium Forged Bar. [J]. Special Casting & Nonferrous Alloys 38(7):784-787(2018)
[1]丁晨,许正芳,章乃俊.TC18钛合金锻棒的方形偏析显微特征[J].特种铸造及有色合金,2018,38(07):784-787. DOI： 10.15980/j.tzzz.2018.07.024.

Ding Chen, Xu Zhengfang, Zhang Naijun. Characterization of Square Segregation in TC18 Titanium Forged Bar. [J]. Special Casting & Nonferrous Alloys 38(7):784-787(2018) DOI： 10.15980/j.tzzz.2018.07.024.

摘要

选择TC18钛合金锻棒中的正常区域和方形偏析区域作为研究对象

使用EBSD技术对其显微特征进行定量表征。结果表明

两者组织形态构成相同

但受Fe和Cr元素偏析影响

方形偏析区域相变点更低

更有利于α相析出和形核

因此α相含量更高;此外

两者区域中的α相集中分布在0

0μm

区间

在温降过程中方形偏析区域速度更慢

因此0

0μm

面积内的小颗粒α相粒子含量明显高于正常区域并且球化率更高

这表明该锻棒不适合作为转动件长期使用。

Abstract

Normal and square segregation area of TC18 titanium forged bar were analyzed.EBSD analysis was employed to quantitatively characterize the micro features of both area.The results indicate that the microstructure constitution is similar.However

due to the influence of Fe and Cr segregation

theβtransus temperature is decreased which is benefits for the precipitation and nucleation ofαphase.Consequently the overallαphase content is higher.Besides

αphase is distributed intensely from 0 to 40μm

.The cooling rate of square segregation area is higher than normal area

thus the 0

0μm

smallαparticle is obviously higher than normal area with a higher globularization ratio.The results show that forged TC18 bar is not qulified as rotating part for long-term use.